A girl with badfat eats fast food every evening followed by a Ben&Jerry's. This contributes to bad fat which gives her a huge flat ass, hanging boobs, sticking out belly, and in the more severe cases a double chin.

These types of girls are bad catches and should be avoided, unless she is a friend of a hot girl of course...

T: Hey man, check out that girl'sass! I wish i could rip those jeans off and do her all night!